Jack for knitting machine needles



June 11,1935. 7' E. o. ROY

JACK FOR KNITTING MACHINE NEEDLES Filed May 12, 1954 lriv'enror, Edmond 0. Roy b WMK with a Patented June 11,

This invention relates are employed in certain JACK FOR KNITTING MACHINE NEEDLES Edmond 0. Roy, Franklin. assign'or to Franklin Needle Com pan'yp Franklin, a v H corporation of New Hampshire, V N I Application May 12, 1934. Sam No. 725,325

1 Claim.

to needle jacks such as types of knitting machines for manipulating the needles, and especially to that type of needle jack which is formed shallow recess in one side, in which recess is located a resilient leaf spring that resiliently and frictionally engages the wall of the groove in the knitting machine in which the jack slides so that sufiicient friction will be produced to hold effectively the jack and its needle from movement in the groove at such times as the jack is not under the control of the operating cam or cams, thereby preventing the jack and its needle from being accidentally displaced by reason of vibration other cause.

A jack of this in various types of th type can of knitting machines.

e machine or from any be advantageously used In the case of a flat link and link type of knitting machine having a racking bodying this invention is mechanism a jack emuseful in holding the jack and its needle in retracted position during the racking of the knitting machine.

In some respects the invention is an improvement on the jack shown in Patent No- 1,940,520,

December 19, 1933. The features wherein the invention resides will be more fully hereinafter set forth and then pointed out in the appended claim.

In the drawing,

Fig. l is a fragmentary ting machine employing Fig. 2 is a side view of sectional view of a knitmy improved jack; the jack;

Fig. 3 is an enlarged section on the line 3-3,

Fig. 2;

Fig. 4 is a perspective view of the leaf spring;

Fig. 5 is an enlarged section on the line 5-5,

Fig. 2;

thought it necessary to illustrate in detail. any

part of the machine other than the portion thereof having the grooves needles operate.

in which the jacks and In the drawing 1 indicates the portion of a knitting machine in which the jacks and needles operate and which may be a needle plate of a flat type machine or the cylinder of a circular machine or the corresponding part of any other knitting machine. Such portion of the knitting machine, which for convenience will be referred to as the needle-receiving portion, is provided with the usual grooves 2 the needles operate.

in which the jacks and 4 indicates one of the needle jacks, this be- I ing provided with the usual butt or lateral extension 5 which has engagement with the cam mechanism by which the needles are actuated, such jack being formed with the recess 6 at its forward end for the purpose of operatively engaging a needle indicated at I.

As. stated above the jack embodying this invention is of that type which is provided with a shallow recess 8 in one side, in which recess is received a leaf spring 9 that projects slightly beyond the surface of the jack and has a resilient frictional engagement with the wall I 6 of the groove 2. i

In making the jack embodying this invention the latter is formed with the recess 8 in any suitable way as by means of a die, and in forming the recess 8 one end ll thereof is made slightly deeper than the remaining portion of the recess. The jack is also formed with a spring-retaining projection l2 rising from the bottom of the recess, said projection preferably being integral with the jack. If the recess is made by means of a die or by the metal stamping operation, then the die will be provided with a recess'corresponding to the shape of the projection It so that when the jack is placed in the press and is subjected to the action of the die for forming the recess 8 the projection l2 will be formed.

Thespring 9, which is a slightly bowed leaf spring, is formed with an opening 53 of a size to receive the projection l2.

In attaching the spring to the jack the spring will be placed in the recess with the opening I3 thereof registering with the projection l2 so that said projection will extend through the opening l3. This projection is then headed over as? shown at I 2 sufiiciently to retain the spring in the recess.

The spring has a thickness slightly less than the depth of the recess so that when the'spring is in the recess the outer face of the ends of the spring will be below the side surface of the jack, the center bowed portion of the spring, of course, projecting slightly beyond the side'of the -jack.

The operation of heading over the projection l2 reduces the length of the projection slightly and when this heading-over operation is completed the end surface E5 of the projection will preferably be slightly below the side face of the jack. When the jack is in the groove 2 the bowed portion of the spring which extends beyond the jack Will have suificient resilient frictional engage ment with the wall I0 of the groove to hold the jack and its needle from being displaced in the 55 groove at such time as the jack is not under the control of a cam.

The forming of the recess and the attaching of the spring to the jack in the manner above described can be accomplished without in any way distorting the jack or producing any irregularities in its surface which will interfere with its smooth and correct operation in the knitting machine. 4 1

The construction shown also pr'ovides'a practical and effective way of anchoring the springin the recess of the jack.

The purpose of making'thei recess slightly deeper at the end where the spring is attached thereto, as shown at l I, is to give sufficient depth at this point to accommodate both'the'spring and of the spring, said projection having a greater transverse dimension in the lengthwise direction of the spring than in a direction transverse thereto and being headed over to retain the spring thereon, the exposed surface of the head lying be- I v U 'low the sidefa'ce of the jack. the head I4 of the riveting projection so that the Y EDMOND O. ROY. 

